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639型二管半导体耳塞收音机是上海无线电九厂的新产品.它的主要特点是:外形小巧玲珑、美观大方、携带方便,在城市和市郊可不用外接天线和地线,即能收听当地电台,在有些地区还可收听中央人民广播电台,特别适宜于旅行、疗养和集体宿舍中使用.在本机的右侧面备有外接天线插孔,在离城市较远的农村中使用时,可装接天线,也能收到相应的电台播音.
639-type two-tube semiconductor earbud radio is a new product of Shanghai Radio Nine.Its main features are: small and exquisite appearance, nice, easy to carry, in the city and the suburbs without external antenna and ground, you can listen to the local radio station, at Some areas also listen to CNR, especially for travel, convalescence and dormitory accommodation. An external antenna jack is available on the right side of the unit and can be used in rural areas farther away from the city Antenna, but also receive the corresponding radio broadcast.